逆变控制是光伏并网发电技术的一个难点问题.针对这一问题,提出了准滑模控制的解决方法.全面介绍了单相光伏并网发电系统的设计方案,在给出系统拓扑结构之后,建立了系统主电路的动态数学模型.简要分析了系统的最大功率点跟踪算法和准滑模控制逆变原理,完成了准滑模并网逆变控制试验.试验表明,基于准滑模控制的单相光伏并网发电系统具有动态响应快、稳态跟踪性能优良的特点,系统设计正确且可行.%Inverting control is one of the difficult problems in photovoltaic grid-connected power generation technique. Aiming at this problem, the solution of quasi-sliding mode control is proposed. The design scheme of single-phase photovoltaic grid-connected power generation system is introduced comprehensively. Based on the lopological structure of the system, the dynamic mathematical model of the main circuit of system is established. The tracking algorithm of the maximum power point in the system and the inverting principle of the quasi-sliding mode control are analyzed briefly. The experiment of quasi-sliding mode grid-connected inverting control is completed. The experimental results show that the single-phase photovoltaic grid-connected power generation system based on quasi-sliding mode control features fast dynamic response and good steady state tracking performance, thus the validity and feasibility of the system design are verified.
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